The B8/8.5 was designed to have the head removed without ever removing the valve cover , which actually is the cam cradle also . This allows the head intake , cams and turbo to be removed from the engine in one complete unit along with all the other stuff bolted to the head. Actually it was more designed for assembly speed as they could have them built in another dept and then just pop them on the block, but that is another story.
In order to accomplish this there has to be a clear path to allow the Ribe tool to pass down through the valve cover to get to the head bolts. The problem lies in the fact the resting position of the engine has the exhaust cam lobes blocking the access to the bolt heads. ( by now you probably know the exhaust cam has high and low lift lobes and they slide on the cam shaft).
In order to get to the bolts you have to move those cam lobes out of the way. This is why you insert the tool into positions 2,3 6,7 and turn the crank 4 times. this moves the cam lobes out of the way.

after you have done all your work and put the head back on you need to move the cam lobes back to their initial position for starting . You now place the tool in positions 1,4,5 and 8. turn the crank 4 times and it slides them back to starting point ... done .
Note: if you are tearing the whole engine down and are removing the valve cover you can get away without it if you dont have the tool . just remove the valve cover and remove the cams ( with all the other hardware required of course, HPFP vacuum pump etc. ) , set them aside and put it back when done. I had the tool but never even bothered using them as i did not move the lobes out of their original positions. i bolted the head down , then installed the cams, then bolted down the cover.
Remember that you are fighting those valve springs when you do bolt down the valve cover so take your time and torque down gently a little at a time until you are clear of all mechanical obstructions.
hope this helps.
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